I have token smart contract that is ERC20 compliant. It is now transferable via any software like MyEtherWallet and similar. I wondering is it possible to forbid token transfer and allow it only using my own site/tool?

1 Answer
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You can create a special account trusted to perform token transfers and customize your smartcontract to reject transfers unless they originate from that trusted account. Your trusted site/tool must have access to unlocked private key of that account to initiate transfers.